The reason dogs can't eat potato skins is because the potato skins contain oxalates which is toxic to dogs when ingested.
It's best to make sure a potato is completely peeled before you feed it to your pet. Potato skins contain oxalates, which can be extremely dangerous for dogs.
A dog who has eaten potato skins may experience loose stools, vomiting, depression, fatigue, tremors, seizures, and heart arrhythmia.
However it's safe to give dogs potato skins after the potato skins have been cooked.
If the potato skins are cooked then yes you can give them to your dog in moderation.
If they are raw do not feed them to your dog.
As a very occasional treat, it is safe to give your dog a small amount of cooked potato skin.